My reading of tfa is exactly that - the author is hoping that we'll have at least a generation or so to adapt, like horses did, but is concerned that it might be significantly more rapid.
"You're absolutely right!" Thanks for pointing it out. I was expecting that kind of perspective when the author brought up horses, but found the conclusion to be odd. Turns out it was just my reading of it.
To be clear though, the horses didn't adapt. Their populate was reduced by orders of a magnitude.